#include <iostream>
#include <initializer_list> 

double sum(std::initializer_list<double> il);
double average(const std::initializer_list<double> &ril);

int main()
{
	using std::cout;

	cout << "List 1: sum = " << sum({ 2,3,4 }) << ", ave = " << average({ 2,3,4 }) << '\n';
	std::initializer_list<double> d1 = {1.1, 2.2, 3.3,4.4, 5.5};
	cout << "List 2: sum = " << sum(d1) << ", ave = " << average(d1) << '\n';
	d1 = {16.0, 25.0,36.0, 40.0, 64.0};
	cout << "List 3: sum = " << sum(d1) << ", ave = " << average(d1) << '\n';
		
	std::cin.get();

	return 0;
}

double sum(std::initializer_list<double> il)
{
	double tot = 0;
	for (auto p = il.begin(); p != il.end(); p++)
	{
		tot += *p;
	}

	return tot;
}

double average(const std::initializer_list<double> &ril)
{
	double tot = 0;
	int n = ril.size();
	double ave = 0.0;

	if (n > 0)
	{
		for (auto p = ril.begin(); p != ril.end(); p++)
		{
			tot += *p;
		}
		ave = tot / n;
	}

	return ave;
}
